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Composition for structural adhesive

a structural adhesive and composition technology, applied in the direction of film/foil adhesives, non-macromolecular adhesive additives, layered products, etc., can solve the problems of unsuitability for certain industrial applications, achieve the effect of improving the rapidity of gelation of adhesives, preserving mechanical properties and strength properties over time, and improving the degree of curing

Active Publication Date: 2013-11-07
JACRET
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]In the context of the present invention, the inventors have substituted this category of tertiary amine with another category of high-molecular-weight tertiary amine which is less toxic, as described in WO 03 / 086327, which makes it possible to preserve the mechanical properties and the strength properties over time by virtue of a degree of curing which is just as high.
[0011]Thus, the amines used in the context of the invention are not toxic, can be used at a lower dosage than the prior art amines, and react completely with the free-radical polymerization initiator. Moreover, surprisingly, such amines improve the rapidity of gelation of adhesives, compared with the prior art amines. This makes it possible to use structural adhesives in new applications, as described hereinafter.

Problems solved by technology

However, these amines have certain disadvantages, in particular with regard to the curing parameters (gelation, exothermicity) which make them unsuitable for certain industrial applications.

Method used

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  • Composition for structural adhesive
  • Composition for structural adhesive
  • Composition for structural adhesive

Examples

Experimental program
Comparison scheme
Effect test

example 1

Raw Materials Used and Methodology

[0111]The following components were used:

[0112]Composition[0113]methacrylate ester monomer (a): methyl methacrylate (MMA) / isobornyl methacrylate / hydroxyethyl methacrylate[0114]functionalized liquid elastomer (f): HYPRO™ VTB 2000×168 (EPM, USA)[0115]acid monomer: methacrylic acid (MAA)[0116]adhesion promoter (b): phosphate methacrylate Genorad 40 (Rahn AG)[0117]cure accelerator (c): 4,4′,4″-methylidyne-tris(N,N-dimethylaniline) (LCV)[0118]cure accelerator (control): N,N-dimethylaniline (DMA), or dimethyl-para-toluidine (DMPT)[0119]toluidine (d): N,N-bis(2-hydroxyethyl)-p-toluidine (PTE)[0120]zinc dimethacrylate (e): SR 708 (Sartomer)[0121]fillers: metal ions, rheology modifiers, pulverulents[0122]SIS copolymer (g): Kraton D1160 (Kraton Polymers)[0123]SIBS copolymer (h): Kraton MD6455 (Kraton Polymers) 25[0124]rheology modifier: Disparlon 6500 (Kusumoto Chemicals)[0125]elastomeric polymeric particles (i): Clearstrength C303H (Arkema).

[0126]Catalyst[01...

example 2

Use of a High-Molecular-Weight Polyamine

[0132]The following compositions were analyzed:

ComponentsA1A2A3A4A5Methyl28.528.528.527.029.0methacrylateVTB28.028.028.028.028.02000x168Isobornyl5.55.55.55.55.5methacrylateHydroxy-6.06.06.06.06.0ethylmethacrylateMethacrylic4.04.04.04.04.0acidGenorad 403.03.03.03.03.0SR 708———1.5—DMA1.0————DMPT1.0—PTE—LCV——1.01.00.5Fillers24.024.024.024.024.0Gel time9 min 25 s4 min 10 s54 s54 s2 min 33 s(on 20 gr)Maximum15 min7 min 36 s8 min 28 s2 min 36 s71 min40 s48 sexo-108° C.116° C.119° C.109.5° C.89° C.thermicityShear16.7 MPa15.7 MPa15.3 MPa17.9 MPa15.8 MPastrengthFracture100%100%100%100%100%surfacescohesivecohesivecohesivecohesivecohesive

[0133]Formulation A1: uses an amine as described in the prior art (control).

[0134]Formulation A2: uses an amine as described in the prior art (control).

[0135]Formulation A3: the gel time is very rapid, the exothermicity peak being more distant.

[0136]Formulation A4: use of SR 708 from Sartomer in combination with LVC: thi...

example 3

Bonding of Hot-Dipped Galvanized Steel to Itself

[0138]Measurement of the shear strength according to the protocol of the ISO 4587 standard (galvanized steel test pieces).

ComponentsB1B2B3B4B5Methyl28.127.425.426.2528.25methacrylate1,4-Naphtho-0.0030.0030.0030.0030.003quinoneVTB28.028.028.028.028.02000x168Isobornyl5.55.55.55.55.5methacrylateHydroxy-6.06.06.06.06.0ethylmethacrylateMethacrylic4.04.04.04.04.0acidGenorad 403.03.03.03.03.0Saccharin——2.02.0—DMA—0.90.9——PTE1.41.21.21.21.2LCV0.5——0.050.05Fillers23.524.024.024.024.0Shear15.7 MPa1.1 MPa9.3 MPa8.2 MPa1.5 MPastrengthFracture100%100%100%100%100%surfacescohesiveadhesiveadhesiveadhesiveadhesiveNB: The shear strength of formulation B1 was performed on aluminum.For B1, gel time (on 20 gr): 11 min 52 s.Maximum exothermicity: 14 min 36 s, 104° C. The gelation time is thus delayed and is close to the maximum exothermicity time. This adhesive is particularly suitable for uses in the field of bonding large parts.

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Abstract

The invention relates to a composition for a structural acrylic adhesive that comprises an adhesion promoter including a phosphate ester and a high molecular-weight polyamine as a polymerisation accelerator.

Description

RELATED APPLICATIONS[0001]This application is a continuation of U.S. application Ser. No. 12 / 933,552, filed Dec. 20, 2010, which is a national stage application (under 35 U.S.C. §371) of PCT / EP2009 / 053332, filed Mar. 20, 2009, which claims benefit of French application Ser. No. 08 / 01553, filed Mar. 21, 2008, the entire contents of each of which applications are incorporated herein by reference.FIELD OF THE INVENTION[0002]The present invention relates to the field of acrylic structural adhesives (based on acrylate or on methacrylate) and to the uses thereof.BACKGROUND OF THE INVENTION[0003]Structural adhesives are a good alternative to other mechanical techniques for binding two materials together, such as metals or plastics. This is because the force distribution is better with bonding than when alternative techniques such as riveting or welding are used. In addition, the use of bonding often makes it possible to work more rapidly, and also has the advantage of providing better insu...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C09J11/06
CPCC09J11/06C08K5/14C08K5/18C08K5/521C09J9/00C09J2433/00C09J4/00
Inventor CURET, ARNAUD
Owner JACRET